OK, so side tone generator is a DSP function. But, your answer leaves a lot of details out.
So, if I am using the side tone generator to zero beat another CW station, I do two things. One, I adjust the sidetone pitch to something I prefer. Two, for the actual CW station, I adjust the VFO until the pitch of the CW signal closely matches my sidetone pitch. (I know, I could push the spot button too and I usually do that). If this is true, then the sidetone generation itself is a function of the VFO frequency, that is, it is, say, 600 Hz away for example in a BFO kind of way. I was looking for a description of more of the details of how this was implemented and I admit it is to satisfy my curiosity. Math functions don't scare me though, I did my graduate work in Math. I admit to being a bit weaker with typical DSP algorithms -- more of a philistine than a practitioner. 73, phil, K7PEH > On Nov 17, 2014, at 2:16 PM, Don Wilhelm <[email protected]> wrote: > > Phil, > > The CW sidetone is nothing more than a set of math functions inside the DSP. > With the proper DSP code, you can make up most any kind of sound wanted, even > sidetone mixed with demodulated signals. That is what the DSP board firmware > is all about (plus a lot more). > > 73, > Don W3FPR > > On 11/17/2014 4:57 PM, Phil Hystad wrote: >> I am asking this question of K3 and KX3 since I am assuming that the answer >> is the same for both rigs. If it is different, maybe someone can let me >> know. >> >> Question: Is the CW sidetone generated as a separate audio oscillator >> circuit or is it generated from a BFO type circuit? This morning, I started >> thinking of this question and I realized that I don’t know too much about >> how CW sidetone is implemented. I am thinking it is a separate audio >> oscillator but I may very well be wrong. >> >> Follow up Question: If the CW sidetone is a separate audio oscillator, what >> is happening (details preferred) when you use the sidetone to zero beat a CW >> signal. >> >> > ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [email protected]
